Design And Research Of Cutter And Tools Of The Underground Pipeline Excavator

The main task of this project is to design a soil excavation system for an underground pipeline excavator with a bore diameter of 500 mm.The function of the earth-rejection system is to transport the earth-slag removed efficiently by the cutterhead to the ground dregs storage area when the underground pipeline excavator is excavating,so as to ensure the efficient and stable excavation of the underground pipeline excavator.This paper has designed a kind of slurry balanced dumping system by studying the current situation of excavation equipment at home and abroad.Firstly,on the basis of reviewing a large amount of relevant data,the present paper proposes two schemes of earth pressure balanced dumping and slurry balanced dumping based on the current method of transporting trenchless excavation equipment.Project overview,through the comparative analysis of the scope of application of the two types of dumping methods,the final selection of slurry balanced dumping method,the program is suitable for small-diameter underground pipe excavator,which solves the problem of realizing the transportation of muck in a narrow internal space.Secondly,the design and research of the slurry conveying system was carried out,which mainly included the design and calculation of the slurry pipe,the layout of slurry pipes,and the selection of the slurry pump.According to the requirement of slurry quality for the underground pipeline excavator during work,a three-stage muddy water treatment system was designed.The first-stage treatment was mainly performed with a double spiral filter for pre-screening,and the second stage passed.The first-stage cyclone was separated and the third-stage treatment was separated by a secondary cyclone,and the design of the double-helical filter and the selection of the cyclone were completed.Finally,the overall structure of the slurry-water balanced dumping system was determined.Using virtual prototype technology,SOLIDWORKS was used to complete the three-dimensional modeling of the slurry-water balance dumping system.Finally,using the two-phase flow model in the Fluent software to numerically simulates the fluid flow state in the slurry pipe,by changing the influence of the parameters of the mud pipeline on the fluid flow state,the influence of the bend radius,inlet flow velocity,particle concentration,and horizontal length on the fluid flow state is mainly achieved,and the optimal parameter value is obtained so that the pressure loss in the mud tube reaches a minimum value.It reduces the wear of the mud pipeline and improves the service life of the mud pipeline.In order to ensure the reliability of the structure,the analysis and optimization of the spiral vane in the mud water treatment system,and finally the structural parameters of the spiral vane performance are optimized through the structural optimization of the spiral vane.Lastly,using ANSYS software,the stiffness and modal analysis of the screw conveyor structure was performed to verify the rationality and reliability of the structure,to lay a certain theoretical foundation for the development of small-diameter trenchless equipment in the future.